Thank you for your question! :)
You're right, you can enter as many as referral codes as you can find! People will type their referral codes in the chatroom which appears 1 hour before the game starts:) Try to enter those and you'll obtain new life cardsssss!
As far as I know, you can change and add addresses. When filling an address of an exchange platform, remember to make sure the transferred token has already been listed on that exchange platform.
Gd luck! :)
Thanks! Got the app, and I'll give the game a shot.